Décapole

{| width="40%" style="float:right;text-align:center" | 70px|alt=Arms of Colmar: Over a field divided vertically, red and green, a gold mace oriented diagonally with its head to the top-right || 70px|alt=Arms of Hagenau: On a blue field, a white cinquefoil (flower with five spearhead-shaped petals) with a red centre || 70px|alt=Arms of Keysersberg: On a white field, a black purse with a gold buckle || 70px|alt=Arms of Mulhouse: On a white field, a red stylised mill wheel || 70px|alt=Arms of Munster: On a white field, a red church consisting of a gateway between two towers all three with a cross on top, the door white and the windows black |- | Colmar || Haguenau || Kaysersberg || Mulhouse || Munster |- | 70px|alt=Arms of Obernai: Over a field divided vertically, red and black, a golden eagle with its wings displayed || 70px|alt=Arms of Rosheim: On a white field, a red rose with yellow centre and green barbs || 70px|alt=Arms of Sélestat: On a white field, a red crowned lion rampant || 70px|alt=Arms of Turckheim: On a white field, a red door with black hinges, latch and ring || 70px|alt=Arms of Wissembourg: On a red field, a white castle with two towers and an open gate, windows black |- | Obernai || Rosheim || Sélestat || Turckheim || Wissembourg |} The Décapole (; , or ) was an alliance formed in 1354 by ten Imperial cities of the Holy Roman Empire in the Alsace region to maintain their rights. It was disbanded in 1679.

In 1354 Emperor Charles IV of Luxembourg ratified the treaty uniting the towns of Haguenau, Colmar, Wissembourg, Turckheim, Obernai, Kaysersberg, Rosheim, Munster, Sélestat and Mulhouse. Hagenau became its capital while the Imperial city of Strasbourg, though venue of the league's diets, remained outside the alliance. The town of Seltz joined the league when it received immediate status in 1357, but had to leave it after its mediatization to the Electorate of the Palatinate in 1414.